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Fail Softly Process for CPU I/O Device Interfacing

Publishing Venue

IBM

Related People

Brown, RP: AUTHOR

Abstract

Partial execution of extended I/O commands is permitted between a CPU and an I/O subsystem which contains multiple I/O devices despite inoperativeness of one of those devices, by effectively stripping the commands associated with the inoperative device from the instruction/data train.

Country

United States

Language

English (United States)

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Fail Softly Process for CPU I/O Device Interfacing

Partial execution of extended I/O commands is permitted between a CPU
and an I/O subsystem which contains multiple I/O devices despite
inoperativeness of one of those devices, by effectively stripping the commands
associated with the inoperative device from the instruction/data train.

The process will be described in an arrangement where CPU 10
communicates through its I/O interface 11 with an I/O subsystem, such as the
IBM 7414 Interactive Console. This subsystem includes common interfacing
controls and decoder circuitry 15, which controls displays on cathode-ray tube
(CRT) 16 and/or printer 17. Controls 15 includes a multiple byte buffer for data
reading or writing in response to execution of an I/O program in CPU 10.
Programs in 10 include in the data transfers to the buffer in 15 appropriate
commands for displays on CRT 16, printing on 17 or both.

For the 7414, data in the buffer is always displayed on CRT 16 and can be
selectively printed on 17, which is typically an IBM 1053 printer. A typical
exchange for an I/O write program presents a write command character, followed
by a series of data characters and an end of transmission (EOT) character. EOT
is preceded by a print command if the data loaded into the buffer in 15 is to be
printed on 17.

Prior to execution of an I/0 program, a printer available interface line from
controls 15 is interrogated and an indication stored in CPU 10 as to whether or
not print...